Photo frame



FIG. 1 is a perspective view of a photo frame;

FIG. 2 is a front elevation view of the photo frame;

FIG. 3 is a rear elevation view of the photo frame;

FIG. 4 is a top plan elevation view of the photo frame;

FIG. 5 is a bottom plan view of the photo frame;

FIG. 6 is a left side elevation view of the photo frame; and,

FIG. 7 is a right side elevation view of the photo frame.

The broken lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for the photo frame, as shown and described. 